Multiplex-telegraph system.



. M.- M. DAVIS & AIJ'IEAVES14I MULTIPLEX TELEGRAPH SYSTEM.

APPLICATION FI'LED rmm, 1912. 3

Patented Dec. 3

W m A TTOR/VEYS To all whom it may concema f AUetisr-Us J. i Eaves, a citizen of States, and'resident ba t c y mm y have invented certain new and ;useful Im- UNITED v STATES MINOR-M. n nvis' AND AueUsrus'J. EA-vns, or new roam m1 Q Application am at,

" Be it known th t we, MINOR M, DAVIS, a.

citizen'of'the UnitediStates, anda resident of [the borough of Brooklyn, county of Kings',city and State'of New York, and the United and State of NewYork,

provements in Multiplex-Telegraph Sysf ten'is', f which the following is a Specifica-f ,livered to tion, 1 v p v a one of the inain'objects'of this invention ..j1s to provide means wherebyjthe outgoing'f signal currents may be directed around or past therece ving instruments, thatfis to say the neutral relay or ,polarf relay, and dethe line, a corresponding balancfling-circuit being carried to theartificial line' I vide meansfor conduetin v -'ceivin g nstruments the inductive disturh' ances coming in over the turbances are of such a character and of such strength as'io be likely to disturb the receiving instruments. 1

Another object of the. invention is to vproaround. the reline when such dis Another .o'b ect of the invention 1s to pro- .vide meansbetween the pole changer and the apparatus when used in with'means for deliver ng the outgolngsigcurrent generators to prevent [sparking be. tween the contact points and the armature of the. pole changer. This'spark preventing the same apparatus nalimpulses to the line around or'past the receiving instruments, operates with great The invention has other importantobjects and-advantages, which Will appear hereinafter and-will be readily appreciated by one skilled in theart.- i In thedrawings, Figurelis a. diagrammatic-view of a quadruplextelegraph ap-- paratus showing only one. end thereofyand 3 Fig-2 a similar'viewshowing aslig'ht variation in the arrangement of the; means for conducting.- the outgoing signal. impulses around the receiving apparatus.

. operated through ner to put-positive or negative current on Referring .to the various parts by numer- 1115, 1 and2. designate the current generators,

the positive'f'side-of; 1 and the negative side of 2 being connected to the stops 3 and l of the pole changer 5. The pole changer 1s he key 6 in the usual man.

the line, the armature of said pole ehanger being connected to the line in the-usual way.

The transmitter 7, is arranged in the usual,

oflthe borough of Man changer .and of the 'transmit-teii;'alfe nected by a conductor and in said is inserted a resistance .10." The back of the transmitter is connected 'to 'through a resistance 12. "The chrrei the'armature of the'tran'sinitter is'spl" to the main line 16 "and the 'otlier portion. ing tothe artificial lined?!" "The?" .lirie may he made up inzany' desired and provided with means "whereby" it" iii-i lie balanced with the main line ,Iii-tlid ing wire with the ends'voffthe hric wire 19 is interposed ac ofndcns'er 20'. In the form of the a Fig. 1 conductors 21 and-22 are'cou mcteu to the main conductor at a po iiit betisjee armature of 1 the transmitter 1 and the thereby making, a path for the current the line to the peak of the signal wave.

"line almost instantly. v impulse is entirely sentthro'ughthe 'recei'ying. instruments the peaIr VKlif 'the 'fuave .is reached slowly, Whereas with H e shown herein the wave would 'shonga rise to its peak and then a genital a zero. It is, of-cou1'se,'niani est v ancing impulse of current In -he transmit ited through conductor 2'2 and t s res stanee and condenser to the'artificial line; The conductors 21 and 22 also serve to take up 1' the inductive disturbances on the main line earers.

are arranged resistances 18, and in the bridge point? Where the currenttis-diyided or split fAs sh own in this view these wiresjai'e connected, at the. pointvvhere the "current is diyided, that is to say at the, inneror honieends of the arms 18 of the-bridgei Thesecoudu'ct'ors areconnected at theirother ends, o 'ie' to the main-line and the other to the artificial line,-

Specification of Letters latent. V t

ary 7,1912, srialnose'zaese."

manner to increase 'or 'de'crease the current i on the line, said transmittenhjc'ingoperated. by the-key- 8. -The atu esd me;pole

injt'he usual, manner in q'ua'clrupl i'i app-r: ratus, and lscarried through-the neutral r'elav '14 and the polar relay one sidc gqing of the bridge connectingthe;inhinfcoiiduct pparatus shown 1n 8C the pole changer. The conductors leading and to preventthem materiality affecting the receivin g instruments, these disturbances being usually caused'byalternating currents picked, up by the main line. The conductors- 21 and 22 with their condensers and'resistances also; ermit of the quick discharge of .the .coils 0 the receiving instruments upon thereversals of the current so 'thatsaid coils do not discharge to ground back through the transmitting instruments. It is manifest that by this arrangement sparking 'a-tthe contact points of the pole changer is practically eliminated.-'

Around the resistance 10in the main conductor 1s arranged a conductor 10 and 1n said conductor 1s arranged 'a condenser 10".

The object of this arrangement is to'pro vide a path for-the inductive disturbances picked up" by the main line to pass around the resistance 10' to earth. TheseQdistnrbances are caused by alternating currents andthese currents'will readily pass throu h the,

condenser 10" and thence to' earth through from the generators 1 and 2 to the stops or contacts of the pole changer are connected together by a wire 25 and in this wire are interposed two condensers 26 and 27, the

wire or conductor between said condensers being grounded at 28. This arran ement prevents sparking at the contacts of t e pole changer and operates with great-efiiciency:

' when used in the'same apparatus. with a means for conducting the outgoing currents around and past the receiving instruments. The wire 25 and the condensers 26 and 27 being grounded at 28, as described, provides a direct path to earth for the alternating currents picked up bythe main line.

In theapparatus illustrated by Fig. 2 of v 'the drawings conductors 22 and 23 are connected to the ends of the bridge .wire. In this arrangement ofthe apparatus the resistance 24 is omitted, the resistances in the arms of the bridge taking place of and serving the same function as the omitted re sistances. This arrangement'of the ap-;

' )aratus ives racticall the same results as "versing the polarity ofthe line and means for increasing and decreasing thc 'current on the line, receiving instrui'nents. conductors to ca lry outgoirig currents around the receiving instru'inerrts to both the main and artlficial hnes,-,a condenser. arranged in each "prising-a" vmam line, two generators, a I changer, a conductor connecting the sitive' between the resistances and the of said conductors and a resistance arranged in each of saidgconductors between said condensers .and the transmitting instruments, in combination with two generators arranged with the positive pole of one and the \negative .pole "of the-other connected to the means for reversing the polarity of the line curr'eht, a resistance in-eac'h of said generators together at a'point between the resistances and the pole changer, two condensers arranged in said conductor, the con ductorybetweeni said condensers being con nect-edto ground. I 2. A multiplex telegraph apparatus conlipo e pole of one generator to the pole 'cianger,

a conductor connecting the negative pole of the other'geiierat or to thepolerchanger, a resistance in each of said conductors, a con-' diictor connecting, the generators together to changer, two condensers arrangedin said conductor,

said conductor between the condense s be-' ingconnected to a ground.

' 3. A. multiplex telegraph-apparatus com prising a main line, two generators, a pole changeri ,a conductor connecting the po t tive'pole of "one generator to, the pole changer, a conductor connecting the no a tire poleof the other generator to the pole .changer, 'aresistaince 1n each of'said c0nductors. a conductor connecting the two gen erators'together between thereslstances and the pole changer. two condensers arranged in said conductor, a ground for'said conductor between the condensers, a trans itter connected to the main line, a resista ce in said line between the transmitter and the pole changer. a conductor connected to said connections, a conductor connecting 'Said main line around the said resistance, a condenser in said conductor, receiving instruments connected to the main line ,and the artificial line, conductors connected to the main line and to the artificial line, both of said conductors'being connected to the main line between the. transmitter and the receiving instruments, a condenser in each of said latter conductors anda resistance in each of said conductorsbetween said condenser and the transmitting instruments.

In testimony whereof we hereunto aflix our signatures in the presence of two witnesses thissixth day of February 1912.

' MINOR -M. DAVIS.

AUGUSTUS J. EAVES.

'itnesses JOIIK A. Srunnow, Lrm: R. ROBERTSON. 

